Mazda

Stove fan 2108 technical specifications. Small tuning of the VAZ heater. Reasons for failure

Every modern person knows the proverb given to us by our ancestors that it is useful to prepare a sleigh in the summer. However, it is not always possible to carry out some types of repair work on time if you own a car. Often the vehicle itself “manages” this process. As soon as something knocks or creaks, you immediately begin to look for the problem. In the same way, the first news about help from your VAZ-2108 begins to arrive. It is not difficult to guess why it is precisely at the moment of the first frost that car owners most often have to face such a problem. It’s just that the days before were hot and warm, so no one even tried to turn on the stove.

So, if the heater motor on your VAZ-2108 howled pitifully and sadly, don’t hesitate, but start carrying out repair work. Of course, many G8 owners don’t even know what actions are important to take to restore the device to excellent performance. In order not to torment you with unnecessary doubts, and not to force you to spend time searching for the necessary information, we are ready to present you with a step-by-step algorithm of actions. If you follow it, you will be no worse than a real master in carrying out repairs, after which the heater fan on your VAZ 2108 will work flawlessly and successfully compete with new devices.

Fan replacement process

Of course, you should prepare for any task; only in these cases can you count on an optimal result. It is imprudent to purchase any spare parts or the new engine itself in advance, since no one knows what the problem is, why your VAZ-2108 howled so much. However, to carry out diagnostics it must first be removed. For these specific actions, you will need to have a Phillips screwdriver, a 10mm socket and a ratchet handle on hand. We will work both from the engine compartment and from the interior.

Algorithm of actions

First, open the hood and unscrew the five bolts that securely secure the plastic trim. We remove it and put it aside so that it does not interfere with us during all subsequent actions. Now remove the rubber seal on the hood as it prevents the fan guard from being removed. As soon as you remove this casing, you will immediately be able to find the motor itself. It is easy to see that it is fastened with two bolts. Arm yourself with a pre-prepared screwdriver and unscrew these bolts.

After this, we suggest that you move into the car interior and prepare to continue working in an uncomfortable position. It is very important to disconnect the power leads. Under the instrument panel you will find a positive wire plug, unplug it. The next step should be to disconnect the negative wire. However, it is additionally secured with a nut located in an inaccessible place. For this reason, try to initially feel it, and then, after getting used to it, unscrew it using a socket and ratchet. Once you disconnect the wires, push them towards the motor itself. Leave the interior and go to the engine compartment again. Grasp the engine with both hands and carefully turn it from side to side to find the optimal location to remove it.

After you manage to remove the heater motor, inspect it to make sure it is intact and free of mechanical damage. If your diagnostics show that it is no longer possible to restore, go to the store and buy a new one. You really don’t want to part with some money, but you still have no other choice. It is impossible to travel without a heater in winter, not only because there is no comfort, but also because such trips are unsafe.

Some craftsmen are making efforts to remake a failed motor. If the bushings on the VAZ or UAZ heater motor “fly”, many decide to insert bearings instead. Indeed, it is possible to resurrect, but especially not to get rid of noise. Only you can decide for yourself whether to purchase a new one or restore the old one; we are not your guide in this matter. In any case, you will also have to perform steps aimed at installing a new or restored motor back into the engine compartment. Don't worry about this because you will have to do the same thing, just in reverse order.

So, as you can see, removing and then installing a new one of your V8 is not an elusive task. It is quite enough to carefully familiarize yourself with the algorithm we have proposed and carry out all the steps flawlessly.

This is what the removed interior heater fan looks like:
1 - protective cover of the heater electric motor;
2 - right heater fan casing; 3 - left heater fan casing; 4 - heater fan support.

Technical characteristics of the electric heater fan motor type 45.3730
Current consumption at maximum rotation speed, A, no more....................................14
Maximum rotation speed of the interior heater fan, min...................................4100

1. Peel off the foam seal from the right casing of the interior heater fan.

2. Remove the support from the interior heater fan casing.

3. Use a screwdriver to pry up the plastic latches of the fan casing and disengage them...

4... and separate the casing parts.

5. Unfasten the two spring latches by prying them with a screwdriver.

6. Remove the interior heater motor cover.

7. Remove the engine with the heater fan impeller. WARNING
Do not remove the interior heater fan impeller from the engine shaft to avoid disturbing the balancing.

8. Unscrew the two screws securing the brush holder.

9. Remove the two cage nuts.

10. Remove the brush holder.

11. Inspect the manifold. If it is heavily soiled or has scratches, marks, or burnt areas, clean the collector with fine sandpaper. For other malfunctions of the interior heater motor, the manufacturer recommends replacing the heater motor.

12. Remove the springs from the guide brushes.

13. Insert two cage nuts.

14. Place an insulating washer onto the shaft.

15. Carefully bend the edges of the guides.

16. Insert the brushes into the guides until they stop.

17. Install the brush holder on the heater motor.

18. Insert the brush springs into the guides.

19. Fold the edges of the guides.

The VAZ 2108 stove fan, like other important parts, is the key to the car’s heating system. Like any other system, this one has its own nuances and can suddenly break down. The solution to some popular problems, even those related to replacing the product, can be found below in the article.

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Car heating system design

The 2108 heating system consists of the following components:

draft, which affects the heater valve of the VAZ 2108;
damper control lever;
additional resistor;
a motor that affects the rotation of the fan;
system operating mode switch.

Heater valve VAZ 2108

Operating principle of the stove

The liquid is heated to a certain temperature and enters the radiator of the VAZ 2108 stove.
To ensure constant circulation, rubber tubes are installed between it and the cooling system for the liquid, fixed for better fastening with clamps.
Warm air enters the car interior through several openings. The heater motor with its own fan is designed to distribute air evenly.
The air flows directly to the feet of the driver and passengers, and also exits to the panel. The heat flow is then delayed by the dampers, and therefore the air is cooled. Thus, cool air is supplied to the windshield.

If the operation of the furnace is not satisfactory, it can be modernized. This is done by installing fiberglass.

The action goes like this:

It is necessary to disassemble the stove, wash all parts and begin assembly. This action can also be used to visually inspect parts for damage. For example, the casing ear often breaks.
After this, you need to glue all the flaps and fill the seams with sealant. Glue the casing and wait a while until the sealant is stable.
Assemble the “insides” of the heating system and cover it with fiberglass. Thanks to this, the temperature will increase to 10 degrees.

Typical faults

As with any mechanism, problems can occur in the heating system (video author: Andrey Kuzemsky).

If the VAZ 2108 heater motor is broken, you can understand this by comparing some symptoms:

If the motor does not work when switching operating modes, the cause of the breakdown may be hidden in the resistor. When repairing, you need to replace the resistor with a new one, because it cannot be repaired.
If the fuse is blown, you need to check the insulation of the armature located on ground. There may be a short circuit.
If, when switching modes, the VAZ 2108 rotates at the same speed, this may be a consequence of contamination or oxidation of the collector. In case of repair, it is worth cleaning the collector and, if nothing has changed and the fan continues to act up, you can replace the bearings.

If the VAZ 2108 stove motor does not even show signs of life, then the reason is not in its design, but in a broken circuit. To find out if this is true, you can use a voltmeter.

DIY repair

To carry out repairs yourself, you need to use the following tools:

a Phillips head screwdriver;
10mm wrench.

When dismantling, you need to remove the plastic trim, which is located on the outside of the windshield. To remove it, you need to open the hood and remove the 5 bolts that secure the trim to the body. Remove the rubber seal from the engine compartment and pry the casing with a screwdriver to get to the motor and oven fan. Now you can remove the motor. It is attached to the body of the VAZ 2108 with two bolts.

When the clamps are disconnected, you can turn off the power and disconnect the positive wire of the furnace under the dashboard. The negative one is attached over a special thread and pressed down with a special nut. You need to unscrew the nut by touch and fold back the negative wire. By disconnecting the wires, you can remove the motor and install a new fan. The entire structure is assembled in reverse order.

It is important to note that breakdowns associated with the stove also depend on which panel is installed on the VAZ - low or high. Both have their downsides. For example, on a high one the central flap does not open completely. It is she who is responsible for supplying cold and hot air to the car interior. To solve this, you need to adjust the damper. And to get to it you need to disassemble the dashboard.

If we talk about the low panel, this is where the thermostat often breaks. Of course, if it wears out, the oven will not work. It is recommended to change it every two or three years. And if replacement does not solve the problems, it is worth replacing the hoses that connect the stove and radiator.

Photo gallery “Stove removal and repairs”

In the photos provided below you can see in more detail how the furnace repair scheme occurs.

The blower fans of the main body heater are driven by a two-pole electric motor - excited by permanent magnets. The main heater electric motor is turned on using a switch having four positions:

Turned off;

Low speed;

Medium speed;

High speed.

At low and medium speeds, a resistor is connected to the electric motor circuit.

Technical characteristics of the main heater electric motor

Type.....511.3730

Power, W.....90

Current consumption when loaded with fans, A, no more.....15

Armature rotation frequency when loaded with fans, rpm.....3000±300

Additional* heater motor

The fan for cooling and cooling the vehicle interior is driven by a two-pole electric heater motor excited by permanent magnets.

The electric motor is turned on using a switch having three positions:

Turned off;

Low speed;

High speed.

At low speeds, a resistor is connected to the electric motor circuit.

Additional heater motor specifications

Type.....197.3730

Power, W.....60

Current consumption at high speed, A, no more.....6.5

Armature rotation frequency at fan load, rpm.....3800

Electric pump* heating system

The electric pump of the heating system is driven by a two-pole electric motor excited by permanent magnets.

The electric motor is switched on using the auxiliary heater switch.

* For vans with two rows of seats and buses.

Technical characteristics of the electric pump

Type.....352.3730 or 32.3780

Power, W.....25

Current consumption at high speed, A, no more.....5

Capacity, l/h, not less.....1400±200

Wiring

The car uses a single-wire system for switching on electrical equipment, the second wire (“ground”) of which is the car body. If the insulation is damaged, the wires can directly touch the car body, causing short circuits that lead to blown fuses, burnt insulation, and even a fire.

For ease of installation and protection from mechanical damage, the wires are braided into bundles with fastening braid.

Maintenance

When inspecting the car, you should carefully check the condition of the insulation of the wires, preventing their damage (rubbing on sharp edges, excessive sagging, etc.). Particular attention should be paid to the cleanliness and reliability of connecting wires to the terminals of electrical equipment. Wires with even minor damage to the insulation must be wrapped with insulating tape. Clean and tighten terminals that are loose or dirty or oxidized. It is necessary to carefully ensure that oil and gasoline do not get on the surface of the wires, as they destroy the insulation and shorten the service life of the wires.

When repairing electrical wiring, you should use a schematic diagram of the wires, which shows the colors and cross-sections of the wires.

Circuit breakers

Under the hood on the right there is a BPR-2M5 fuse box, where a 90 A fuse link protects the generator circuit, the light circuit of the car, and a 60 A fuse link protects the general positive circuit of the car, except for the light circuit, and the starter and generator circuits.

On the left under the instrument panel, two BPR-13 fuse blocks are installed on a bracket. The maximum current values in amperes for each fuse and the circuits they protect are given in table. 9.7.

Table 9.7.

Circuits protected by fuses
Fuse number	Current strength, A	Circuits protected by fuses
Upper block fuses protect circuits:
		spare
		alarm
		radio battery switch
		windshield wiper, windshield washer, right row of interior lamps

		brake signals
		horn, cigarette lighter
		electric heater motor, electric heating pump (buses and cars with two rows of seats)
		auxiliary heater electric motor (buses and vans with two rows of seats)
		instrument cluster, reverse light, speed sensor, parking brake warning switch, windshield wiper relay
		spare
		microprocessor ignition system (ZMZ-4061, -4063)
		direction indicators
Lower block fuses protect circuits:
		spare
		high beam right headlight, high beam warning light
		left high beam headlight
		low beam right headlight
		low beam left headlight
		fog lights, fog light indicator
		spare
		spare
		cabin lamp, lamp (shades - GAZ-2705 with one row of seats) of the cargo compartment, bus step lamp, engine compartment lamp, left row of bus passenger compartment lamps
		instrument lighting, switches, cigarette lighter